Radio Shack TRC-447 Service Manual page 47

Symbol
Pin
No.
TX RX WX
8 0.0 0.0 0.0
9
10 0-5V Alert Pulse @ Alert
11
12
13
IC401 14
15 5.0 5.0 5.0
16 5.0 5.0 5.0
17 5.0 5.0 5.0
18
19 0.0 0.0 0.0
20 0.0 0.0 0.0
Unit [V]
Mode
Comment
PA ALERT
0.0 - MODE
NC
DOUT
NC
NC
NC
NC
5.0 - VDD
5.0 - S1
5.0 - S0
NC
0.0 - DT2
0.0 - DT1
Symbol
Pin Pin
No.
TX
1 1.4
2 0.8
IC501 3 0.0
4 6.2
5 13.4
1 13.4
IC502 2 0.0
3 8.0
— 47 —
Mode
Comment
RX WX PA
1.4 1.4 1.4
0.8 0.8 0.8
0.0 0.0 0.0
6.3 6.3 6.3
13.7 13.7 13.7
13.7 13.7 13.7
0.0 0.0 0.0
8.0 8.0 8.0
Unit [V]
+IN
-IN
GND
OUT
Vc
IN
GND
OUT